/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Drawing/PointSetComponent.h
The points are drawn as two triangles (ie a square) orthogonal to the view direction. The actual point size is calculated in the shader, and so a custom material must be used.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)() class UPointSetComponent : public [UMeshComponent](API\Runtime\Engine\Components\UMeshComponent)